1122122212121 has 2 divisors, whose sum is σ = 1122122212122. Its totient is φ = 1122122212120.

The previous prime is 1122122212111. The next prime is 1122122212147. The reversal of 1122122212121 is 1212122212211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090103046400 + 32019165721 = 1044080^2 + 178939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1122122212121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1122122212093 and 1122122212102.

It is not a weakly prime, because it can be changed into another prime (1122122212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561061106060 + 561061106061.

It is an arithmetic number, because the mean of its divisors is an integer number (561061106061).

Almost surely, 2^{1122122212121} is an apocalyptic number.

It is an amenable number.

1122122212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122122212121 is an equidigital number, since it uses as much as digits as its factorization.

1122122212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 20.

Adding to 1122122212121 its reverse (1212122212211), we get a palindrome (2334244424332).

The spelling of 1122122212121 in words is "one trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".